(6)  
SSM 35-11-01

 (7)  
WDM 35-11-13

 B. Access
 (1)  Location Zone 124 Forward Cargo Container Compartment, Aft Half Right
 C. Procedure
 NOTE: You must install the voltage averaging unit (AMM 35-11-12/401)
____
 before you make the the change to the wires.

 S 912-024
 (1)  
Read and obey the safety precautions and general instructions before you do the maintenance (Ref 35-00-00/201).

 S 862-025

 (2)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag:

 (a)  P7 Overhead Circuit Breaker Panel
 1) 7D4 OXYGEN VALVE & IND

 S 012-014
 (3)  
Open the access panels to the passenger oxygen cylinders which are attached by snaps and velcro tape.

 S 032-015

 (4)  
Disconnect the electrical connector DM992 from the voltage averaging unit, M992 for the crew oxygen system.

 S 862-016

 (5)  
Make a splice and install the jumper wire (P/N W1092-106-22) on the electrical connector to connect the pins 11 and 12.

 NOTE: The voltage averaging unit will give two times the
____ correct voltage if the pins 11 and 12 are not connected. The crew oxygen pressure on the EICAS status page will show two times the average cylinder pressure.
 S 432-017
 (6)  
Connect the electrical connector on voltage averaging unit and install a safety wire.

 (7)  
Supply the electrical power (Ref 24-22-00/201).

 S 862-018
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747-400 MAINTENANCE MANUAL
 S 862-026
 (8)  Remove the DO-NOT-CLOSE tag and close this circuit breaker:
 (a)  P7 Overhead Circuit Breaker Panel
 1)  7D4 OXYGEN VALVE & IND
 S 782-027
 (9)  Do the task: "Crew Oxygen Pressure Indication Test" (Ref
 35-11-00/501).
 NOTE:____ This will make sure the pressure for the crew oxygen system
 is shown on the EICAS status page.

 S 412-021
 (10)
 Close the access panels to the passenger oxygen cylinders which are attached by snaps and velcro tape.

 S 862-022

 (11)
 Remove the electrical power if it is not necessary (Ref 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 CREW OXYGEN SYSTEM - ADJUSTMENT/TEST
____________________________________
 1.  General_______
 A.  These tasks are included in the procedure:
 (1)  
Operational Test

 (2)  
Crew Oxygen Pressure Indication Test

 (3)  
Crew Oxygen Mask, Stowage Box Test (In-Situ)

 (4)  
Crew Oxygen Mask/Regulator Test

 (5)  
System Leak Test

 (6)  
Crew Oxygen Pressure Reducer and Pressure Regulator Test.

 B.  The operational test is a minimum check to find if the system will operate correctly. No equipment is needed to do this test.
 (1) The operational test includes the pressure indication test and a in-situ test of the mask and demand regulator stowage box.
 C.  The system test is done when sufficient maintenance has been completed and you are sure the system is in satisfactory condition. It is a complete check of each component to make sure it will function and operate within the system.
 (1)  The system test includes; a system leak test, a pressure indication test, a mask and demand regulator and stowage box test. It also includes a functional test of the pressure reducer, and a pressure regulator test.
 TASK 35-11-00-715-193
 2.  Crew Oxygen Operational Test____________________________
 A.  References
　
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